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A/C Signal: Testing and Inspection
A Tech 1 scan tool is used to diagnose the system, it has the ability to display the A/C request input to the instrument panel cluster, as well as displaying when the
Powertrain Control Module has commanded the A/C clutch "ON," and display A/C refrigerant pressure sensor input voltage. Chart C-10 A/C Clutch Control should be used for diagnosing the electrical portion of the A/C circuit.
Chart C-10 A/C Clutch Control Circuit Diagnosis